CN107276554A - A kind of analog phase shifter and radiofrequency signal phase shifting method - Google Patents
A kind of analog phase shifter and radiofrequency signal phase shifting method Download PDFInfo
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- CN107276554A CN107276554A CN201710483578.0A CN201710483578A CN107276554A CN 107276554 A CN107276554 A CN 107276554A CN 201710483578 A CN201710483578 A CN 201710483578A CN 107276554 A CN107276554 A CN 107276554A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/18—Networks for phase shifting
- H03H7/20—Two-port phase shifters providing an adjustable phase shift
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/18—Networks for phase shifting
- H03H7/19—Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/18—Phase-shifters
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Abstract
The present invention relates to a kind of analog phase shifter and radiofrequency signal phase shifting method, and in particular to a kind of with the analog phase shifter that radiofrequency signal phase is controlled on the wide frequency ranges changed close to linear phase.Exemplary analog phase shifter includes front end high-pass and low-pass filter, rear end high-pass and low-pass filter and all-pass filter, and the all-pass filter is connected between two high-pass and low-pass filters.At least one in first high-pass and low-pass filter, the second high-pass and low-pass filter and all-pass filter is tunable, with the phase of control input signal over a wide frequency range.High-pass and low-pass filter includes low pass filter unit, and the low pass filter unit is as the input interface or output interface of high-pass filter unit to improve the impedance matching for receiving or exporting radiofrequency signal.
Description
Technical field
The present invention relates to communication equipment field, and in particular to a kind of analog phase shifter and radiofrequency signal phase shifting method.
Background technology
In numerous applications, it is desirable to by inputting control voltage (or electric current) with the width changed close to linear phase
The phase of control signal in frequency range.Its benefit be have on whole operating frequency range it is constant or close to constant
Planet phasing sensitivity.Do so it is highly useful, particularly with order under identical input stimulus obtain it is uncorrelated to frequency
Or the phase modulated signal on the wide frequency ranges of substantially incoherent phase-modulation.It is moreover desirable that realizing insertion loss
Relatively low and flat wideband phase modulating performance.
At present, for be combined with the broadband analog phase shifter of single or multiple all-pass filters (APF) carried out it is a variety of
Research.Single all-pass filter will not provide flat response over a frequency range by itself, but multiple not by connecting
The all-pass filter unit tuned with centre frequency, the phase-shift response curve added up causes compound phase-frequency response, so as to
The phase of relatively flat can be provided in certain specific frequency range.But, multiple all-pass filters for concentrating on different frequency of connecting
Ripple device unit is defective.Because the phase shift range of single all-pass filter unit is limited, therefore in identical (or phase
Multiple all-pass filter units of centre frequency seemingly) may need to be provided desired total phase shift, and this would potentially result in twice
Or more insertion loss.
Accordingly, it would be desirable to which a kind of be used for control radiofrequency signal phase on the wide frequency ranges changed close to linear phase
Analog phase shifter.
The content of the invention
The present invention relates to communication equipment field, more particularly, to for the wideband changed close to linear phase
The system, apparatus and method of radiofrequency signal phase are controlled in rate scope.
In the prior art, carried out for being combined with the broadband analog phase shifter of single or multiple all-pass filters (APF)
A variety of researchs.Fig. 1 is the United States Patent (USP) (patent No.：8610477) a kind of circuit block diagram of analog phase shifter 30 disclosed in.As schemed
Shown in 1, the analog phase shifter 30 includes low pass filter 32, all-pass filter 34 and the high-pass filter 36 being sequentially connected in series.
The all-pass filter 34 is arranged between low pass filter 32 and high-pass filter 36.Low pass filter 32 and high-pass filter
36 be five rank tunable optic filters.Low pass filter 32 is preferably designed with equal to or higher than analog phase shifter passband
The cut-off frequency of middle highest frequency.High-pass filter 36 is designed as having in the passband equal to or less than analog phase shifter 30 most
Low-frequency cut-off frequency.The centre frequency of all-pass filter 34 can close to analog phase shifter 30 centre frequency, and slightly
It is micro- that response is mutated with the phase frequency for offsetting high-pass filter 36 close to low-frequency range, so as to provide flat phase with the change of frequency
Position response.
United States Patent (USP) (the patent No.：8610477) phase shifter disclosed in is by introducing one-level positioned at low pass unit and high pass list
All-pass unit between member, more phase shifts are generated in centre frequency, and improve the flat of phase shift over a wide frequency range
Degree.The phase shifter of the patent also has the defect for limiting its application.In principle, the matching of all-pass filter and external circuit is most
Difference.The matching of high-pass filter is better than all-pass filter, but poorer than low pass filter.The matching of low pass filter is generally most
It is good, because it has the lumped parameter model similar to transmission line model, as the United States Patent (USP) (patent No.：8610477) institute is public
Open, high-pass filter direct-coupling can be disturbed external circuit formation on all-pass filter, and this will reduce its matching degree,
Especially when working frequency increases.Moreover, the phase shifter of the patent has asymmetric scattering parameter S11 and S22, increase
The complexity of design.
In order to overcome drawbacks described above, the present invention is achieved through the following technical solutions：A kind of analog phase shifter, including：First
High-pass and low-pass filter, first high-pass and low-pass filter include the first low pass filter unit, the second low pass filter unit, with
And first high-pass filter unit, first high-pass filter unit is connected on the first low pass filter unit and the second low pass
Between filter cell；First low pass filter unit is used to receive radio-frequency input signals, and the second low pass filter unit is used for
Export the output signal of the first high-pass and low-pass filter；All-pass filter, the all-pass filter is coupled to receive the first height
The output signal of bandpass filter, and export all-pass wave filtering output signal；Second high-pass and low-pass filter, the second high LPF
Device includes the 3rd low pass filter unit, the 4th low pass filter unit and the second high-pass filter unit, the filter of the second high pass
Ripple device unit is connected between the 3rd low pass filter unit and the 4th low pass filter unit；3rd low pass filter unit is used
In receiving all-pass wave filtering output signal, the 4th low pass filter is used to export radio frequency output signal.
Further, the first low pass filter unit and the 4th low pass filter unit are symmetrical on all-pass filter, the
Two low pass filter units and the 3rd low pass filter unit are symmetrical on all-pass filter.
Further, the first high-pass and low-pass filter and the second high-pass and low-pass filter include multiple-order low-pass wave filter unit and
High-pass filter unit, the low pass filter unit and high-pass filter unit are alternately connected.
Further, the second low pass filter unit and the 3rd low pass filter unit are high-order low-pass filter.
Further, the first high-pass and low-pass filter and the second high-pass and low-pass filter are symmetrical on all-pass filter.
Further, the first high-pass and low-pass filter, all-pass filter and the second high-pass and low-pass filter are connected to one
Common DC power source is used for filter tuner to receive common DC tuning signal.
Further, the first high-pass and low-pass filter, all-pass filter and the second high-pass and low-pass filter are each attached to one
Individual independent dc source is used for filter tuner to receive independent direct current tuning signal.
Further, the first high-pass and low-pass filter, all-pass filter and the second high-pass and low-pass filter by biasing resistor,
And connected with biasing resistor dc source is inductively coupled to individually to receive respective direct current tuning signal.
A kind of radiofrequency signal phase shifting method, including：
(a) the first high-pass and low-pass filter receives radio-frequency input signals, and first high-pass and low-pass filter includes being sequentially connected in series
The first low pass filter unit, the first high-pass filter unit and the second low pass filter unit, first low pass filtered
Ripple device unit improves the impedance matching of the first high-pass and low-pass filter to receive radio-frequency input signals；
(b) all-pass filter receives the output signal of the first high-pass and low-pass filter from the second low pass filter unit；
(c) the second high-pass and low-pass filter receives the output signal of all-pass filter, and the second high-pass and low-pass filter is included successively
The 3rd low pass filter, the second high-pass filter and the 4th low pass filter of series connection, the 3rd low pass filter unit
Improve the matching between the second high-pass filter and all-pass filter；And
(d) radio frequency output signal is exported from the 4th low pass filter of the second high-pass and low-pass filter.
Further, the first high-pass and low-pass filter, all-pass filter and the second high-pass and low-pass filter be it is adjustable,
And be connected to a common DC power source to receive common DC tuning signal for filter tuner.
In some embodiments, feature of the invention is a kind of analog phase shifter, and the analog phase shifter includes being used to connect
The first high-pass and low-pass filter (HLP) of receipts radio-frequency input signals, the second high-pass and low-pass filter for exporting radio frequency output signal,
And it is connected on the all-pass filter (APF) between the first high-pass and low-pass filter and the second high-pass and low-pass filter.Example of the present invention
Property analog phase shifter can be tuned so as to the phase of control signal over a wide frequency range.First high-pass and low-pass filter and
Two high-pass and low-pass filters are used to avoid all-pass filter from being joined directly together with external circuit.First high-pass and low-pass filter and the second height
Bandpass filter has a series of cascaded structures, and the cascaded structure includes the first low pass filter (LPF) unit, the second LPF
High-pass filter (HPF) unit of device unit and coupling therebetween.Further, all-pass filter direct-coupling exists
Between the low pass filter unit of first high-pass and low-pass filter and the low pass filter unit of the second high-pass and low-pass filter.This company
Mode is connect also for the high-pass filtering for avoiding same first high-pass and low-pass filter of all-pass filter and the second high-pass and low-pass filter
Interference is formed between device unit.
In some embodiments, with the low pass filter unit of direct-coupled first high-pass and low-pass filter of all-pass filter
Low pass filter unit with the second high-pass and low-pass filter is the second order filter for including an inductance and an electric capacity.
In section Example, with the low pass filter unit of direct-coupled first high-pass and low-pass filter of all-pass filter and the second height
The low pass filter unit of bandpass filter is the five rank wave filters for including three inductance and two electric capacity.Compared to using two
Rank low pass filter unit, extra phase shift range and broader frequency model may be produced using five rank low pass filter units
Enclose, but its cost is to generate extra insertion loss.
In certain embodiments, all-pass filter (APF), the first high-pass and low-pass filter and the second high-pass and low-pass filter are wrapped
One or more variable capacitances are included, variable capacitance is used for the phase for adjusting radio-frequency input signals.Each variable capacitance includes becoming
Hold diode, or variable capacitance is used as using varactor.The capacitance of the varactor can be by each coupling
Biasing resistor be tuned by shared direct current tuning signal.
In certain embodiments, all-pass filter (APF), the first high-pass and low-pass filter and the second high-pass and low-pass filter include
One or more variable capacitances for modulated RF input signal phase.Variable capacitance includes varactor, the transfiguration
The capacitance of diode can be modulated by the biasing resistor each coupled by shared HVDC Modulation signal.Implement in part
In example, be in series with blocking inductance Lc on each biasing resistor, blocking inductance Lc be used to providing enhanced direct current and radiofrequency signal every
From.
In some embodiments, the variable capacitance of all-pass filter, the first high-pass and low-pass filter and the second high LPF
Device couples respective dc source so that above-mentioned each wave filter can be tuned individually.Each dc source is set to have not
With voltage level to meet respective tuning demand, and improve phase shifter entirety IP3 (third order intermodulation point, it is logical for weighing
Believe the index of the linearity of system or equipment).Further, the blocking inductance Lc coupled with respective DC voltage VDC node
With biasing resistor Rbias equally can have different values so that for each wave filter provides optimization direct current and radiofrequency signal every
From performance.
In some embodiments, the bond-wire inductor for being connected to rf inputs mouthful or radio frequency output port is high low pass filtered
A part for ripple device, more specifically, the bond-wire inductor for high-pass and low-pass filter low pass filter unit a part with
Auxiliary input or output matching.Above-mentioned configuration adds filter when single chip microwave integrated circuit chip is assembled into surface mount packages
The practicality of ripple device.
In some embodiments, the first high-pass and low-pass filter and the second high-pass and low-pass filter are cascading filter, the level
Joining wave filter includes the high-pass filter unit and low pass filter unit of multiple alternately series connection, and head and the tail two ends are low pass filtered
Ripple device unit.This configuration provides the flexible of the filter order of selection low pass filter unit and high-pass filter unit
Property.Under normal circumstances, the exponent number of wave filter is bigger, and the bandwidth brought is wider, phase shift range is bigger, but can produce extra insertion
Loss.Similarly, the high-pass filter unit or low pass filter unit that high-pass and low-pass filter has are more, its bandwidth and phase shift
Scope is more, but also results in insertion loss increase.Further, the first high-pass and low-pass filter and the second high-pass and low-pass filter phase
With and around all-pass filter (APF) symmetrically, and its low pass filter unit is coupled with external circuit, so that the phase shifter can have
There are improved matching and symmetrical S11/S22 so that circuit design is more prone to.
It should be recognized by those skilled in the art that high-pass and low-pass filter and all-pass filter can combine to form different knots
Structure.Those skilled in the art can be with further insight to the first high-pass and low-pass filter, the second high-pass and low-pass filter and all-pass filter
Ripple device can be integrated on same semiconductor chip, or is made up of multiple different semiconductor chips.All combinations thereofs
It should all fall among protection scope of the present invention.
Brief description of the drawings
Exemplary embodiment shown in the drawings of the present invention is for reference, and the effect of accompanying drawing is illustrative and not limiting
Invention.Although the present invention is substantially recorded in embodiment, the purpose so done is not to be limited to protection scope of the present invention
In the particular technique feature of described embodiment, accompanying drawing：
Fig. 1 is a kind of circuit block diagram of analog phase shifter in the prior art；
Fig. 2 be the embodiment of the present invention 1 in analog phase shifter circuit block diagram；
Fig. 3 be the embodiment of the present invention 2 in analog phase shifter circuit block diagram；
Fig. 4 be the embodiment of the present invention 3 in analog phase shifter circuit block diagram；
Fig. 5 be the embodiment of the present invention 4 in analog phase shifter circuit block diagram.
It should be recognized by those skilled in the art that numerous embodiments and the implementation of the present invention can be implemented according to specification
Example.All these embodiments and embodiment should be included in the scope of the protection.
Embodiment
In the following description, in order to explain the present invention, the detail of the present invention will be stated to facilitate understanding, but this hair
It is bright can also to be implemented by some or all of described detail.The embodiment of invention described below may quilt
Included in many different electronic devices, circuit, equipment and system.System and equipment shown in the circuit block diagram of accompanying drawing are used
To illustrate the exemplary embodiment of the present invention, and not as the pretext for obscuring wide in range guidance of the invention.Shown in accompanying drawing
Element between annexation be not limited to be directly connected to, but can be changed, reconstructed or changed by intermediate module
's.
It is expressed to be meant that and the implementation when mentioning " one embodiment " or " some embodiment " in the description
The relevant concrete property of example, structure, feature or function are included in the embodiment desired by least one of the present invention.Therefore,
The phrase " in one embodiment " that diverse location occurs in specification does not constitute repeatedly drawing to single embodiment of the invention
With.
Each embodiment of the present invention is applied to the phase for controlling broadband rf signal, controlled phase by analog phase shifter
Position, which has close to linear phase shift, to be changed.Analog phase shifter is coupled and carried comprising one or more filter modules or unit
For phase shift function.These filter modules or unit can be constituted on a single substrate or by different discrete devices with integrated.Enter one
Step, analog phase shifter disclosed in this invention can be integrated in same chip substrate with other device cells, or integrated
In multiple different chip substrates.
Embodiment 1：
Fig. 2 shows the analog phase shifter 200 in one embodiment of the invention.The analog phase shifter 200 includes first
High-pass and low-pass filter 210, the second high-pass and low-pass filter 220 and all-pass filter 230, the all-pass filter 230 are connected on
Between first high-pass and low-pass filter 210 and the second high-pass and low-pass filter 220, all-pass filter 230 is used to aid in tuning phase shift.The
One high-pass and low-pass filter 210 receives radio-frequency input signals RF from input 202in, and export the first high-pass and low-pass filter output letter
Numbers 218.All-pass filter 230 receives the first high-pass and low-pass filter output signal 218, and exports all-pass wave filtering output signal
238.Second high-pass and low-pass filter 220 receives the all-pass wave filtering output signal 238, and defeated by the output radio frequency of output end 204
Go out signal RFout.The radio frequency output signal RFoutIn radio-frequency input signals RFinOn the basis of have controllable relative phase
Move.Fixed capacity Cb is provided between first high-pass and low-pass filter 210 and input 202, for DC-isolation.Also for
DC-isolation, fixed capacity Cb is also equipped between the second high-pass and low-pass filter 220 and output end 204.It is preferred that, first is high
The high-pass and low-pass filter 220 of low pass filter 210 and second is symmetrical on all-pass filter 230 so that analog phase shifter, which has, to be changed
The matching entered and symmetrical S11/S22, facilitate the design of circuit and the use of user.
First high-pass and low-pass filter 210, also referred to as front end filter, including the first low pass filter unit 212, second
Low pass filter unit 214 and be connected between the first low pass filter unit and the second low pass filter unit first
High-pass filter unit 216.First low pass filter unit 212, also referred to as front end input interface, for promoting the first height
The impedance matching of bandpass filter 210 (front end filter) is to receive radio-frequency input signals.In some embodiments, the first low pass filtered
Ripple device unit 212 is second-order low-pass filter, and it, which includes an inductance L1a and electric capacity a D1a, the electric capacity D1a, to be
Variable capacitance, such as varactor, the parameter for tuning filtering device；Second low pass filter unit 214, before being also referred to as
Output interface is held, is equally second-order low-pass filter, it can be variable that it, which includes inductance L3a and electric capacity D4a, the electric capacity D4a,
Electric capacity, such as varactor, the parameter for tuning filtering device.First high-pass filter unit 216 is connected on including two
Variable-capacitance element D2a and D3a on radio-frequency signal path, in addition to the by-pass inductor element coupled with radio-frequency signal path
L2a。
Similarly, the second high-pass and low-pass filter 220, also referred to as rear end filter, including the 3rd low pass filter unit
222 (also referred to as rear end input interfaces), the 4th low pass filter unit 224 and it is connected on the 3rd low pass filter and the
The second high-pass filter unit 226 between four low pass filters.The output of 4th low pass filter 224, also referred to as rear end connects
Mouthful, for promoting the resistance between the second high-pass and low-pass filter 220 (rear end filter) and external circuit (not shown in figures)
It is anti-to match to export radio frequency output signal.In some embodiments, the unit of the 3rd low pass filter 222 is second-order low-pass filter
Device, it includes an inductance L3b and electric capacity a D4b, the electric capacity D4b can be variable capacitance, such as varactor, use
In the parameter of tuning filtering device；4th low pass filter unit 224 is also second-order low-pass filter, and it includes an inductance L1b
Can become inductance capacitor, such as varactor, the ginseng for tuning filtering device with electric capacity a D1b, the electric capacity D1b
Number.Second high-pass filter unit 226 includes two the variable-capacitance element D2b and D3b being connected on radio-frequency signal path, also
Including the by-pass inductor element L2b coupled with radio-frequency signal path.
In some embodiments, the first low pass filter unit 212 and the 4th low pass filter unit 224 are symmetrical or mutual
For mirror-image structure.Second low pass filter unit 214 and the 3rd low pass filter unit 222 is symmetrical or mirror image each other.It is above-mentioned
Configuration ensure that the symmetrical S11/S12 of analog phase shifter 200.Further, the first low pass filter unit 212 and second is low
Pass filter unit 214 can be configured as on the symmetrical structure of the first high-pass filter unit 216；3rd low pass filter
The low pass filter unit 224 of unit 222 and the 4th can be configured as symmetrically tying on the second high-pass filter unit 226
Structure.
In some embodiments, the first low pass filter unit 212 has the first low-pass cut-off frequencies (when the first low pass filtered
Ripple device unit makes input signal power weak to half or to frequency during 3dB), first low-pass cut-off frequencies are defeated higher than radio frequency
Enter the frequency range of signal.Second low-frequency filter unit 214 has the second low-pass cut-off frequencies, the second low pass cutoff frequency
Rate is equally higher than the frequency range of radio-frequency input signals.Second low-pass cut-off frequencies can be identical with the first low-pass cut-off frequencies,
It can also differ.First high-pass filter unit 216 has the first high pass cutoff less than radio-frequency input signals frequency range
Frequency；Second high-pass filter unit 226 has the second high pass cut off frequency also below radio-frequency input signals frequency range.On
State a certain frequency or a certain for setting and ensuring that radio-frequency input signals has between high pass cut off frequency and low-pass cut-off frequencies
Frequency range.Further, the second high pass cut off frequency both can be identical with the first high pass cut off frequency, can also be different.The
Three low pass filter units 222 have the 3rd low-pass cut-off frequencies, and the 3rd low-pass cut-off frequencies can be with the second low pass filter
Second low-pass cut-off frequencies of unit 214 are identical.4th low pass filter unit 224 has the 4th low-pass cut-off frequencies, and this
Four low-pass cut-off frequencies can be identical with the first low-pass cut-off frequencies of the first low pass filter unit 212.This configuration can be true
Protecting analog phase shifter 200 not only has symmetrical structure, also with symmetrical running parameter.
Further, all-pass filter 230 has the operating frequency range of covering radio-frequency input signals frequency range.All-pass
The operating frequency range of wave filter 230 can be with low pass filter unit lowpass frequency scope and the height of high-pass filter unit
Logical overlapping frequency ranges, can not also be overlapping.In one embodiment, all-pass filter 230 has and radio-frequency input signals
The centre frequency (for example, logarithm centre frequency) that frequency matches.For example, when the frequency of radio-frequency input signals is 2GHz, entirely
The centre frequency of bandpass filter is also configured as 2GHz.And for example, when the frequency of radio-frequency input signals is located between 2GHz and 3GHz,
The centre frequency of all-pass filter 230 is set to 2.45GHz (the logarithm central value between 2GHz and 3GHz), and its frequency range
2GHz is covered to 3GHz.Low pass filter unit, high-pass filter unit in previously described analog phase shifter 200 and
The cut-off frequency of all-pass filter is also applied for analog phase shifter 300, analog phase shifter 400 or analog phase shifter 500.
As shown in Fig. 2 all-pass filter 230 include two fixed inductances L4a, L4b and two variable capacitance D5a,
D5b, described fixed inductance L4a, L4b are in parallel with variable capacitance D5a, D5b.Variable capacitance D6 is bypassed from fixed inductance L4a
Tie point coupling grounding between fixed inductance L4b.Preferably, variable capacitance D5a, D5b electric capacity is equal, and is substantially equal to
Bypass the half of variable capacitance D6 capacitance.Biasing resistor Rbias 237 in parallel is coupling in variable capacitance D5a, D5b company
Between contact and earth terminal variable capacitance, for providing DC earthing path for variable capacitance D5a, D5b.All-pass filter 230
It is connected to the second low pass filter unit 214 of the first high-pass and low-pass filter 210 and the low pass filtered of the second high-pass and low-pass filter 220
Between ripple device 222, to prevent the externally connected circuit of all-pass filter 230, it also avoid all-pass filter and the first high pass filtered
Ripple device unit 216, the second high-pass filter unit 226 are directly connected to.
In some embodiments, the first high-pass and low-pass filter 210, the second high-pass and low-pass filter 220 and all-pass filter 230
Coupled to shared DC bias power VDC to be tuned.Specifically, common DC grid bias power supply VDC passes through biasing resistor
219 are connected with the tie point of the first low pass filter unit 212 and the first high-pass filter unit 216；Common DC bias plasma
Source VDC passes through the connection between the low pass filter unit 224 of biasing resistor 229 and the 4th and the second high-pass filter unit 226
Point connection；Common DC grid bias power supply VDC is also connected by biasing resistor 239 with the variable capacitance D6 of all-pass filter 230.For
Realize and individually tune, the resistance value of biasing resistor 219,229 and 239 can be with identical, can also be different.
Embodiment 2：
Fig. 3 shows the analog phase shifter 300 of second embodiment of the invention, and the analog phase shifter 300 includes first
High-pass and low-pass filter 310, the second high-pass and low-pass filter 320 and all-pass filter 330.Mould shown in analog phase shifter 300 and Fig. 2
Intend phase shifter 200 similar, except following distinctive points.First high-pass and low-pass filter 310 include the first low pass filter unit 312,
Second low pass filter unit 314 and it is connected on the first low pass filter unit 312 and the second low pass filter unit 314
Between the first high-pass filter unit 316.Second high-pass and low-pass filter 320 includes the 3rd low pass filter unit the 322, the 4th
Low pass filter unit 324 and it is connected between the 3rd low pass filter unit 322 and the 4th low pass filter unit 324
The second high-pass filter unit 326.With the second low pass filter unit 214 and the 3rd low pass filter unit shown in Fig. 2
222 is different, and the second low pass filter unit 314 and the 3rd low pass filter unit 322 are five rank low pass filter units, without
It is second-order low-pass filter unit.Compared with second-order low-pass filter unit, using five rank low pass filter units 314,322 energy
Extra phase shift range and broader frequency range is enough produced, but its defect is to produce extra insertion loss.
As shown in figure 3, all-pass filter 330 is similar with all-pass filter 230 in Fig. 2, also it is five rank all-pass wave filterings
Device.All-pass filter 330 includes two fixed inductances L6a, L6b and two variable capacitances D6a, D6b, and fixed inductance
L6a, L6b are in parallel with variable capacitance D6a, D6b.Bypass companies of the variable capacitance D6 from fixed inductance L6a and fixed inductance L6b
Contacts couple is grounded.Preferably, variable capacitance D6a and variable capacitance D6b capacitance are equal, and substantially variable capacitance D6 electricity
The half of capacitance.Also include branch road, the branch road includes the bypass biasing resistor Rbias 337 and inductor Lc336 of series connection, the branch
Road is connected between earth terminal and variable capacitance D6a and variable capacitance D6b tie point, for being carried for variable capacitance D6a, D6b
For DC earthing path.All-pass filter 330 is coupling in the second low pass filter unit 314 of the first high-pass and low-pass filter 310
And second high-pass and low-pass filter 320 low pass filter unit 322 between, so as to avoid all-pass filter 330 and external circuit
Connection, it is thus also avoided that the direct-coupling of all-pass filter 330 is on the first high-pass filter 316, the second high-pass filter 326.
Further, the first high-pass and low-pass filter 310, the second high-pass and low-pass filter 320 and all-pass filter 330 are by each
From biasing resistor Rbias and the increased blocking inductance Lc connected with biasing resistor Rbias be connected to it is shared straight
Flow on grid bias power supply VDC, the increased blocking inductance Lc of institute isolates for providing enhanced direct current with radiofrequency signal.
Analog phase shifter 300 keeps symmetrical structure, its high-pass and low-pass filter 320 of the first high-pass and low-pass filter 310 and second
It is symmetrical on all-pass filter 330.Therefore, analog phase shifter 300 also has symmetrical S11/S22 parameters.But, the first height
The high-pass and low-pass filter 320 of bandpass filter 310 and second be individually not it is symmetrical because the first low pass filter unit 312 with
Second low pass filter unit 314 is differed, and the 4th low pass filter unit 324 and the 3rd low pass filter unit 322
Differ.
Embodiment 3：
Fig. 4 is the analog phase shifter 400 of third embodiment of the invention, and the analog phase shifter 400 includes bonding line
Inductance Lw, the bond-wire inductor Lw are a part for low pass filter unit, for promoting input or output matching.It is similar to
Analog phase shifter 200 shown in Fig. 2, analog phase shifter 400 also includes the first high-pass and low-pass filter 410, the second high low pass filtered
Ripple device 420 and the all-pass filter being coupling between the first high-pass and low-pass filter 410 and the second high-pass and low-pass filter 420
430.First high-pass and low-pass filter 410 includes the first low pass filter unit 412 (also referred to as front end input interface), the
One low pass filter unit 412 receives radio-frequency input signals by input VRF402；Also include the second low pass filter unit
414 and the first high-pass filtering for being connected between the first low pass filter unit 412 and the second low pass filter unit 414
Device unit 416.Second high-pass and low-pass filter 420 includes the 3rd low pass filter unit 422, the 4th low pass filter unit 424
(also referred to as rear end output interface), the 4th low pass filter unit 424 is used to export radio frequency by output end VRF404
Output signal, the second high-pass and low-pass filter 420 also includes the second high-pass filter unit 426, the second high-pass filter list
Member 426 is connected between the 3rd low pass filter unit 422 and the 4th low pass filter unit 424.
Different from the analog phase shifter 300 shown in the analog phase shifter 200 and Fig. 3 shown in Fig. 2, the first low pass filter list
Member 412 and the 4th low pass filter unit 424 be combined with bond-wire inductor Lw as it is respective a part with aid in input/it is defeated
Go out matching.This combination adds the practicality of wave filter when single chip microwave integrated circuit chip is assembled into surface mount packages
Property.Further, it is above-mentioned to regard bond-wire inductor as the one of the first low pass filter unit 412 and the 4th low pass filter 424
Partial combination adds the first low pass filter unit 412 and the phase shift range of the 4th low pass filter 424, so as to improve
The overall performance of analog phase shifter.
The distinctive points of analog phase shifter 400 and analog phase shifter 300, analog phase shifter 200 are also resided in：First high low pass filtered
Ripple device 410, the second high-pass and low-pass filter 420 and all-pass filter 430 couple respectively respective dc source (VDC1, VDC2 or
Person VDC3), rather than be coupling on shared dc source.This configuration ensure that each wave filter can be adjusted individually
It is humorous.Each dc source can be configured to the requirement tuned respectively with different voltage levels to meet, and lift simulation
The overall IP3 (third order intermodulation point, the linearity for measuring communication system or equipment) of phase shifter.Further, the first height
Bandpass filter 410, the second high-pass and low-pass filter 420 and all-pass filter 430 are inclined by respective biasing resistor and additionally same
The blocking inductive of resistant series is put on respective dc source.Each biasing resistor (Rbias1, Rbias2 or Rbias3)
And all there is each blocking inductance (Lc1, Lc2 or Lc3) different values to provide single optimization to coupled wave filter
Direct current and radiofrequency signal isolation performance.Analog phase shifter 400 can also balanced configuration, as long as the He of the first high-pass and low-pass filter 410
Second high-pass and low-pass filter 420 is symmetrical on all-pass filter 430.Therefore, analog phase shifter 400 may still have symmetrical
S11/S22 parameters.
Those skilled in the art are it should also be realized that the various modifications of the embodiment shown in Fig. 4 are also applicatory.Example
Such as, although as shown in figure 4, the first high-pass and low-pass filter 410 and the second high-pass and low-pass filter 420 are individually not symmetrical structure,
But analog phase shifter 400 can be changed with so that the first high-pass and low-pass filter 410 and the second high-pass and low-pass filter 420 still have
On respective high-pass filter unit (being respectively the first high-pass filter unit 416 and the second high-pass filter unit 426)
The structure of symmetrical structure or near symmetrical.Exemplary modification can make the second low pass filter unit 414 and the 3rd
Low pass filter unit 422 has and the first low pass filter unit 412 and the identical rank of the 4th low pass filter unit 424
Number.Analog phase shifter 400 can also be modified to make the first high-pass and low-pass filter 410, the second high-pass and low-pass filter 420 and all-pass
Wave filter 430 is coupling on identical dc source.Above-mentioned various modifications are each fallen within protection scope of the present invention.
Embodiment 4：
Fig. 5 is the circuit block diagram of the analog phase shifter 500 in four embodiment of the invention, the analog phase shifter 500
Including the first multistage multistage high-pass and low-pass filter 520 of high-pass and low-pass filter 510, second and it is series at all-pass wave filtering between the two
Device 530.First high-pass and low-pass filter 510 and the second high-pass and low-pass filter 520 are cascading filter, and the cascading filter includes
The high-pass filter unit and low pass filter unit of multi-stage alternate series connection, and head and the tail two ends are low pass filter unit.This
Plant the flexibility of the exponent number of configuration provides selection low pass filter unit and high-pass filter unit.Under normal circumstances, filter
The exponent number of device is bigger, and the bandwidth and phase shift range that can be produced are more, but can produce extra insertion loss.Similarly, height
The high-pass filter unit or low pass filter unit that bandpass filter has are more, and its bandwidth and phase shift range are more, but also can
Insertion loss is caused to increase.Further, the first high-pass and low-pass filter and the second high-pass and low-pass filter it is identical and around all-pass filter
Ripple device is symmetrical, and its low pass filter unit is connected with external circuit, so that the analog phase shifter may have improved matching
With symmetrical S11/S22 so that the use of circuit design and user is more prone to.
Exemplary configuration shown in Fig. 2 to Fig. 4, for example share common DC power source, couple respective dc source,
It is combined with bond-wire inductor, the filter construction for selected high-pass filter unit or low pass filter unit combination high-order
Etc., these configurations are equally applicable to analog phase shifter 500 to obtain extra advantage and flexibility.
The foregoing description of the present invention is used to be aware and understood the present invention, rather than disclosed for limiting the present invention to
In precise forms, the various modifications made in disclosure of that are similarly possible to fall into the guarantor of claims of the present invention
Protect in scope.
Skilled person would appreciate that previously described example and embodiment are exemplary, rather than it is used for
Limit the scope of the invention.It is with good grounds read made by after description of the invention and research accompanying drawing of the present invention for
Obviously replace, strengthen for those skilled in the art, it is equivalent, with reference to and improve and should all fall into the spirit of the present invention and protect
Protect in scope.
It should also be noted that different arrangements can be carried out between element mentioned in each claim, including tool
There are a variety of dependences, structure and combination.For example, in certain embodiments, the main contents of each claim can be tied mutually
Close.
Claims (10)
1. a kind of analog phase shifter, it is characterised in that including：
First high-pass and low-pass filter, first high-pass and low-pass filter includes the first low pass filter unit, the second LPF
Device unit and the first high-pass filter unit, first high-pass filter unit are connected on the first low pass filter unit
And second between low pass filter unit；First low pass filter unit is used to receive radio-frequency input signals, the second LPF
Device unit is used for the output signal for exporting the first high-pass and low-pass filter；
All-pass filter, the all-pass filter is coupled to receive the output signal of the first high-pass and low-pass filter, and exports complete
Pass filter output signal；
Second high-pass and low-pass filter, second high-pass and low-pass filter includes the 3rd low pass filter unit, the 4th LPF
Device unit and the second high-pass filter unit, second high-pass filter unit are connected on the 3rd low pass filter unit
And the 4th between low pass filter unit；3rd low pass filter unit is used to receive all-pass wave filtering output signal, the 4th low pass
Wave filter is used to export radio frequency output signal.
2. a kind of analog phase shifter according to claim 1, it is characterised in that first low pass filter unit and
Four low pass filter units are symmetrical on all-pass filter, the second low pass filter unit and the 3rd low pass filter unit on
All-pass filter is symmetrical.
3. a kind of analog phase shifter according to claim 1, it is characterised in that first high-pass and low-pass filter and second
High-pass and low-pass filter includes multiple-order low-pass wave filter unit and high-pass filter unit, the low pass filter unit and high pass
Filter cell is alternately connected.
4. a kind of analog phase shifter according to claim 1, it is characterised in that second low pass filter unit and
Three low pass filter units are high-order low-pass filter.
5. a kind of analog phase shifter according to claim 1, it is characterised in that first high-pass and low-pass filter and second
High-pass and low-pass filter is symmetrical on all-pass filter.
6. a kind of analog phase shifter according to any one of claim 1-5, it is characterised in that the first high low pass filtered
Ripple device, all-pass filter and the second high-pass and low-pass filter are connected to a common DC power source to receive common DC tune
Humorous signal is used for filter tuner.
7. a kind of analog phase shifter according to any one of claim 1-5, it is characterised in that the first high low pass filtered
It is individually straight to receive that ripple device, all-pass filter and the second high-pass and low-pass filter are each attached to an independent dc source
Flowing tuning signal is used for filter tuner.
8. a kind of analog phase shifter according to claim 7, it is characterised in that first high-pass and low-pass filter, all-pass
What wave filter and the second high-pass and low-pass filter were connected by biasing resistor and with biasing resistor is inductively coupled to dc source
Individually to receive respective direct current tuning signal.
9. a kind of radiofrequency signal phase shifting method, including：
(a) the first high-pass and low-pass filter receives radio-frequency input signals, and first high-pass and low-pass filter includes the be sequentially connected in series
One low pass filter unit, the first high-pass filter unit and the second low pass filter unit, first low pass filter
Unit improves the impedance matching of the first high-pass and low-pass filter to receive radio-frequency input signals；
(b) all-pass filter receives the output signal of the first high-pass and low-pass filter from the second low pass filter unit；
(c) the second high-pass and low-pass filter receives the output signal of all-pass filter, and the second high-pass and low-pass filter includes being sequentially connected in series
The 3rd low pass filter, the second high-pass filter and the 4th low pass filter, the 3rd low pass filter unit improves
Matching between second high-pass filter and all-pass filter；And
(d) radio frequency output signal is exported from the 4th low pass filter of the second high-pass and low-pass filter.
10. a kind of radiofrequency signal phase shifting method according to claim 9, it is characterised in that the first high LPF
Device, all-pass filter and the second high-pass and low-pass filter are adjustable, and are connected to a common DC power source to receive
Common DC tuning signal is used for filter tuner.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710483578.0A CN107276554B (en) | 2017-06-22 | 2017-06-22 | Analog phase shifter and radio frequency signal phase shifting method |
| US15/679,690 US10193519B2 (en) | 2017-06-22 | 2017-08-17 | Analog phase shifter and a method for shifting phase of RF signals |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710483578.0A CN107276554B (en) | 2017-06-22 | 2017-06-22 | Analog phase shifter and radio frequency signal phase shifting method |
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| CN107276554B CN107276554B (en) | 2020-09-22 |
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| US (1) | US10193519B2 (en) |
| CN (1) | CN107276554B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509940A (en) * | 2018-12-26 | 2019-03-22 | 南京米乐为微电子科技有限公司 | A kind of continuously adjustable analog phase shifter |
| CN112271419A (en) * | 2020-09-30 | 2021-01-26 | 中电天奥有限公司 | Ultra-wideband digital phase shifter with all-pass filter structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111416614B (en) | 2020-04-10 | 2023-10-27 | 成都仕芯半导体有限公司 | High-linearity radio frequency circuit and method for improving linearity of radio frequency circuit |
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| EP0403176A2 (en) * | 1989-06-12 | 1990-12-19 | Raytheon Company | Continually variable analog phase shifter |
| CN1346538A (en) * | 2000-02-08 | 2002-04-24 | 三菱电机株式会社 | Multistage amplifier |
| CN1498457A (en) * | 2002-01-29 | 2004-05-19 | ���µ�����ҵ��ʽ���� | Direct conversion receiver and DC offset reducing method |
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| US20110267119A1 (en) * | 2010-05-03 | 2011-11-03 | Michael Koechlin | Wideband analog phase shifter |
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| US20060067254A1 (en) * | 2004-09-27 | 2006-03-30 | Sawtek, Inc. | Triband passive signal receptor network |
| US7276993B2 (en) | 2005-05-31 | 2007-10-02 | Agile Rf, Inc. | Analog phase shifter using cascaded voltage tunable capacitor |
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|---|---|---|---|---|
| EP0403176A2 (en) * | 1989-06-12 | 1990-12-19 | Raytheon Company | Continually variable analog phase shifter |
| CN1346538A (en) * | 2000-02-08 | 2002-04-24 | 三菱电机株式会社 | Multistage amplifier |
| CN1498457A (en) * | 2002-01-29 | 2004-05-19 | ���µ�����ҵ��ʽ���� | Direct conversion receiver and DC offset reducing method |
| CN101507113A (en) * | 2006-08-21 | 2009-08-12 | 贺利实公司 | Broadband impedance matching circuit using high pass and low pass filter sections |
| US20110267119A1 (en) * | 2010-05-03 | 2011-11-03 | Michael Koechlin | Wideband analog phase shifter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509940A (en) * | 2018-12-26 | 2019-03-22 | 南京米乐为微电子科技有限公司 | A kind of continuously adjustable analog phase shifter |
| WO2020134419A1 (en) * | 2018-12-26 | 2020-07-02 | 南京米乐为微电子科技有限公司 | Continuously adjustable analog phase shifter |
| CN112271419A (en) * | 2020-09-30 | 2021-01-26 | 中电天奥有限公司 | Ultra-wideband digital phase shifter with all-pass filter structure |
Also Published As
| Publication number | Publication date |
|---|---|
| US10193519B2 (en) | 2019-01-29 |
| US20180375486A1 (en) | 2018-12-27 |
| CN107276554B (en) | 2020-09-22 |
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